Why capacitors are used to improve power factor?
Last Answer : Capacitors generate reactive power instead of that drawn from source which is required by inductive loads.so it reduce the reactive current which is drawn from source to be drawn from capacitor.This control in Electric bills cost.
Show More
183 views
3 answers
asked
Aug 18, 2019
by
anonymous
Can a synchronous condenser improve power factor?
Last Answer : Yes, synchronous condenser can improve power factor.
Show More
90 views
1 answer
asked
Mar 19, 2018
by
anonymous
How can we improve power factor using synchronous motor?
Show More
78 views
0 answers
asked
Mar 15, 2018
by
anonymous
Last Answer : For high value of diversity factor, a power station of given installed capacity will be in a position to supply more number of consumers.
Show More
169 views
1 answer
asked
Mar 20, 2018
by
anonymous
Last Answer : More than 100%
Show More
158 views
2 answers
asked
Mar 20, 2018
by
anonymous
Capacitors for power factor correction are rated in?
Last Answer : Capacitors for power factor correction are rated in kVAR.
Show More
84 views
1 answer
asked
Mar 25, 2018
by
anonymous
How does a capacitor improve power factor?
Last Answer : Every circuit are usually more inductive than capacitive.it means that the current lags by voltage at small angle.hence we have to compensate this situation so we use Capacitor then this lag is compensate ... angle becomes low and the value of cos(phase angle) is increase and hence power also max.
Show More
163 views
1 answer
asked
Dec 16, 2017
by
anonymous
Last Answer : The primary reason for low power factor is supply system is due to installation of induction motors.
Show More
115 views
1 answer
asked
Mar 20, 2018
by
anonymous
In a synchronous generator delivering lagging power factor load (1) the excitation emf leads terminal voltage by the power angle (2) the excitation emf lags terminal voltage by the power angle (3) ... by the power factor angle (4) excitation emf lags the terminal voltage by the power factor angle
Last Answer : In a synchronous generator delivering lagging power factor load the excitation emf leads terminal voltage by the power angle
Show More
340 views
1 answer
asked
Apr 29, 2018
by
anonymous
The power factor angle and torque angle of a salient pole synchronous generator drawing a current of 1.0 pu from a lagging load are 45o and 15o, respectively. The direct axis and quadrature axis currents, respectively, are (A) 0.5 pu ... pu, 0.5 pu (C) 0.707 pu, 0.707 pu (D) 0.5 pu, 0.5 pu
Last Answer : The power factor angle and torque angle of a salient pole synchronous generator drawing a current of 1.0 pu from a lagging load are 45o and 15o, respectively. The direct axis and quadrature axis currents, respectively, are 0.866 pu, 0.5 pu
Show More
97 views
1 answer
asked
Apr 28, 2018
by
anonymous
A synchronous motor has better power factor as compared to that of an equivalent induction motor. This is mainly because?
Last Answer : A synchronous motor has better power factor as compared to that of an equivalent induction motor. This is mainly because stator supply is not required to produce magnetic field.
Show More
169 views
1 answer
asked
Mar 20, 2018
by
anonymous
Last Answer : The standard full-load power factor ratings for synchronous motors are unity or 0.8 leading.
Show More
98 views
1 answer
asked
Mar 20, 2018
by
anonymous
.jpg)
Last Answer : For power factor correction, synchronous motors operate at no-load and greatly over-excited fields.
Show More
110 views
1 answer
asked
Mar 20, 2018
by
anonymous
If we change the excitation of synchronous machine will it affect on power factor?
Last Answer : Yes, If we change the excitation of synchronous machine it will affect on power factor. If the synchronous motor is overexcited then it will have leading power factor and if the motor is underexcited then it will have lagging power factor.
Show More
123 views
1 answer
asked
Mar 18, 2018
by
anonymous
If the load of the normally excited synchronous motor is increased the power factor will?
Last Answer : If the load of the normally excited synchronous motor is increased the power factor will become lagging.
Show More
150 views
1 answer
asked
Mar 18, 2018
by
anonymous
The synchronous motor which works on leading power factor and does not drive any mechanical load is called?
Last Answer : The synchronous motor which works on leading power factor and does not drive any mechanical load is called synchronous condenser.
Show More
162 views
1 answer
asked
Mar 18, 2018
by
anonymous
If the field of synchronous motor is under excited, power factor will be?
Last Answer : If the field of synchronous motor is under excited, power factor will be lagging.
Show More
483 views
1 answer
asked
Mar 18, 2018
by
anonymous
Last Answer : Yes, we can make the power factor of synchronous motor leading by adjusting its excitation.
Show More
109 views
1 answer
asked
Mar 6, 2018
by
anonymous
The benefit of power factor correction in a power system is (A) lower power consumption (B) increased demand charge (C) reduced load carrying capabilities in existing lines (D) reduced voltage profile
Last Answer : The benefit of power factor correction in a power system is lower power consumption
Show More
104 views
1 answer
asked
Apr 28, 2018
by
anonymous
Power factor of the system is kept high?
Last Answer : Power factor of the system is kept high to reduce line losses, to maximise the utilization of the capacities of generators, lines and transformers, to reduce voltage regulation of the line.
Show More
143 views
1 answer
asked
Mar 25, 2018
by
anonymous
Last Answer : In an interconnected system, the diversity factor of the whole system increases.
Show More
193 views
1 answer
asked
Mar 20, 2018
by
anonymous
Grid distribution system
Last Answer : Grid distribution system:- In this system, when the feeder or loop or ring is charged (energized) by two or more than two substations from two or more than two different generating stations then it is known as “Grid distribution system. In this system only one feeder is utilized at a time.
Show More
58 views
1 answer
asked
May 22, 2020
by
anonymous
Define: primary and secondary distribution system
Last Answer : i) Primary Distribution: It is a 3-phase, 3-wire transmission line connected in between receiving substation to Distribution substation. OR It is link between receiving substation & ... substation to consumer line. OR It is link between distribution transformer substation & consumer.
Show More
167 views
1 answer
asked
May 22, 2020
by
anonymous
State the losses in secondary distribution system.
Last Answer : The losses in secondary distribution system: a) Technical losses: 1. Due to poor voltage 2. Due to unbalance load 3. Due poor quality of transformer & its components 4. Due to poor quality ... of induction type of energy meter. 3. Lack of administration. 4. Energy theft 5. Unmetered supply
Show More
122 views
1 answer
asked
May 3, 2020
by
anonymous
.jpg)
requirements of a distribution system
Last Answer : Following requirements of a distribution system. 1. Layout should be simple in design. 2. It should have less initial cost 3. The distribution system should have minimum distribution ... stability of existing distribution system. 15. Time required for completion of work should be less.
Show More
85 views
1 answer
asked
Aug 25, 2019
by
anonymous
Why radial distribution system used for short distance ?
Last Answer : Because of following disadvantages radial distribution system is not used for long distance: Since there is only one feeder to DTC feed at one point so, 1) There is no reliability ... more time for fault finding & repairing Hence radial distribution system is used for short distance.
Show More
112 views
1 answer
asked
Aug 25, 2019
by
anonymous
Explain following techniques related to energy conservation in transmission and distribution system. (i) By balancing phase currents (ii) Variable technical losses (I2R losses).
Last Answer : (i) Balancing Phase currents: Proper (healthy balanced) three phase loads always draw equal currents in all lines but single phase loads in the 3 phase 4 wire system or loads connected between two ... . 11) Minimize I2R losses. 12) Balance the load currents. 13) Regulate the system voltages.
Show More
195 views
1 answer
asked
Sep 22, 2018
by
anonymous
The permissible voltage variation in transmission and distribution system is: (A) ± 0.1% (B) ± 1% (C) ±10% (D) ± 25%
Last Answer : The permissible voltage variation in transmission and distribution system is: ±10%
Show More
482 views
1 answer
asked
May 8, 2018
by
anonymous
The main criterion for selection of the size of a radial distribution system is
Last Answer : The main criterion for selection of the size of a radial distribution system is voltage drop
Show More
348 views
1 answer
asked
Apr 29, 2018
by
anonymous
103 views
0 answers
asked
Mar 20, 2018
by
anonymous
Last Answer : An induction motor has relatively high power factor at near full load.
Show More
91 views
1 answer
asked
Mar 20, 2018
by
anonymous
Last Answer : For a consumer the most economical power factor is generally 0.95 lagging .
Show More
209 views
1 answer
asked
Mar 20, 2018
by
anonymous
Last Answer : Load factor of a power station is generally less than unity.
Show More
107 views
1 answer
asked
Mar 20, 2018
by
anonymous
Last Answer : Load factor of a power station is defined as average load/maximum demand.
Show More
321 views
1 answer
asked
Mar 20, 2018
by
anonymous
What is the maximum value of power factor?
Last Answer : 1 is the maximum value of power factor.
Show More
118 views
1 answer
asked
Mar 19, 2018
by
anonymous
Last Answer : In a power or distribution transformer about 10 percent end turns are heavily insulated to withstand the high voltage drop due to line surge produced by the shunting capacitance of the end turns.
Show More
128 views
1 answer
asked
Mar 19, 2018
by
anonymous
.jpg)
What is the value of capacitance required to improve power factor from 0.7 to 0.9. Given that: Real power = 50 W Vrms of the source = 120 Frequency = 50 Hz #powerfactor
Show More
197 views
0 answers
asked
May 17, 2020
by
anonymous
The maximum reluctance power of a salient-pole synchronous motor having direct-axis reactance, 1.0 pu and quadrature-axis reactance, 0.5 pu, and input voltage, 1.0 pu is (A) 0.25 pu (B) 0.5 pu (C) 1.0 pu (D) 1.5 pu
Last Answer : The maximum reluctance power of a salient-pole synchronous motor having direct-axis reactance, 1.0 pu and quadrature-axis reactance, 0.5 pu, and input voltage, 1.0 pu is 0.5 pu
Show More
98 views
1 answer
asked
Apr 28, 2018
by
anonymous
Last Answer : Synchronsizing power of a synchronous machine is inversely proportional to the synchronous reactance.
Show More
95 views
1 answer
asked
Mar 20, 2018
by
anonymous
The synchronous motor will develop maximum power when the load angle is?
Last Answer : The synchronous motor will develop maximum power when the load angle is 900.
Show More
223 views
1 answer
asked
Mar 18, 2018
by
anonymous
A control system having unit damping factor will give (1) Oscillatory response (2) Undamped response (3) Critically damped response (4) No response
Last Answer : 1
Show More
1.3k views
2 answers
asked
May 1, 2018
by
anonymous
The damping factor of a particular system is unity, the system response will be
Last Answer : The damping factor of a particular system is unity, the system response will be critically damped
Show More
405 views
1 answer
asked
Apr 26, 2018
by
anonymous
How is marble floor installed?
Last Answer : After the cladding tiles made from natural marble began to appear on the market, it became possible to arrange real marble floors. Increasingly, marble floors can be found in residential mansions and ... . It is also desirable to treat the surface of the marble with a protective polymerizing film.
Show More
10 views
1 answer
asked
Mar 29, 2021
by
anonymous
Phase modifier is normally installed
Last Answer : Phase modifier is normally installed in case of long lines
Show More
337 views
1 answer
asked
Apr 28, 2018
by
anonymous
.jpg)
Last Answer : An isolator is installed generally on both sides of a circuit breaker.
Show More
147 views
1 answer
asked
Mar 20, 2018
by
anonymous
Last Answer : For cost and safety, the outdoor substations are installed for voltages above 33 kV.
Show More
103 views
1 answer
asked
Mar 20, 2018
by
anonymous
Capacitors
Last Answer : .embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed-container embed { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }
Show More
181 views
2 answers
asked
Apr 19, 2020
by
anonymous
State any four types of capacitors.
Last Answer : Types of capacitors: i) Air capacitor ii) Paper capacitor iii) Mica capacitor iv) Ceramic capacitor v) Electrolytic capacitor vi) Poly-carbon capacitor
Show More
103 views
1 answer
asked
Sep 4, 2018
by
anonymous
.jpg)
What is the charge on each capacitor when a 150 V is applied across two capacitors with values 5 μF and 10 μF, connected in series? A) 500 μC B) 0.5 μC C) 0.5 C D) None of these
Last Answer : What is the charge on each capacitor when a 150 V is applied across two capacitors with values 5 μF and 10 μF, connected in series? A) 500 μC B) 0.5 μC C) 0.5 C D) None of these
Show More
100 views
1 answer
asked
Apr 29, 2018
by
anonymous
The circuit has resistors, capacitors and semi-conductor diodes. The circuit will be known as
Last Answer : The circuit has resistors, capacitors and semi-conductor diodes. The circuit will be known as non-linear circuit.
Show More
335 views
1 answer
asked
Mar 25, 2018
by
anonymous
.jpg)